Abstract
It was already shown that antifreeze glycoproteins isolated from the blood of fish occurring in circumpolar regions inhibited the growth of ice crystals both in vitro and in vivo. When the spermatozoa were frozen to liquid nitrogen temperature, addition of antifreeze glycoproteins to cryoconserving media made it possible to decrease twofold the concentration of the synthetic cryoprotector dimethylsulfoxide without the loss and even with a certain increase in the number of viable spermatozoa. This effect was observed in the case of combined, rather than separate, addition of the fraction of weakly active (low molecular weight) and active (high molecular weight) antifreeze glycoproteins. Here, we studied the effect of antifreeze glycoproteins on the survival of carp spermatozoa under storage at 4°C for varying periods of time. In the presence of total fraction of low and high molecular weight antifreeze glycoproteins (2 and 10 mg/ml) added in a physiological proportion (3 : 1), the survival of spermatozoa increase but this increase did not depend linearly on the medium concentration of protein. Low and high molecular weight antifreeze glycoproteins added separately (10 mg/ml) either did not affect or slightly affected the preservation of cells. The hypothermic effect of antifreeze glycoproteins in water was significantly higher than in a medium with salt activator.
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Karanova, M.V., Pronina, N.D. & Tsvetkova, L.I. The Effect of Antifreeze Glycoproteins on Survival of Fish Spermatozoa under the Conditions of Long-Term Storage at 4°C. Biology Bulletin 29, 75–79 (2002). https://doi.org/10.1023/A:1013298003947
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DOI: https://doi.org/10.1023/A:1013298003947